scholarly journals Automated Tracking of Structural Steel Members at the Construction Site

2000 ◽  
Author(s):  
Karen M. Furlani ◽  
Lawrence E. Pfeffer
Keyword(s):  
Structural Steel ◽  
Construction Site ◽  
Automated Tracking ◽  
Steel Members

scholarly journals Absolute stress measurement of structural steel members with ultrasonic shear-wave spectral analysis method

2017 ◽  
Vol 18 (1) ◽  
pp. 216-231 ◽  
Author(s):  
Zuohua Li ◽  
Jingbo He ◽  
Jun Teng ◽  
Qin Huang ◽  
Ying Wang
Keyword(s):  
Spectral Analysis ◽  
Structural Steel ◽  
Shear Wave ◽  
Wave Amplitude ◽  
Stress Measurement ◽  
Amplitude Spectrum ◽  
Uniaxial Stress ◽  
Wave Pulse ◽  
Steel Members ◽  
Pulse Echo

Absolute stress in structural steel members is an important parameter for the design, construction, and servicing of steel structures. However, it is difficult to measure via traditional approaches to structural health monitoring. The ultrasonic time-of-flight method has been widely studied for monitoring absolute stress by measuring the change in ultrasonic propagation time induced by stress. The time-of-flight of the two separated shear-wave modes induced by birefringence, which is particular to shear waves, is also affected by stress to different degrees. Their synthesis signal amplitude spectrum exhibits a minimum that varies with stress, which makes it a potential approach to evaluating uniaxial stress using the shear-wave amplitude spectrum. In this study, the effect of steel-member stress on the shear-wave amplitude spectrum from the interference of two shear waves produced by birefringence is investigated, and a method of uniaxial absolute stress measurement using shear-wave spectral analysis is proposed. Specifically, a theoretical expression is derived for the shear-wave pulse-echo amplitude spectrum, leading to a formula for evaluating uniaxial absolute stress. Three steel-member specimens are employed to investigate the influence of uniaxial stress on the shear-wave pulse-echo amplitude spectrum. The testing results indicate that the amplitude spectrum changes with stress and that the inverse of the first characteristic frequency in the amplitude spectrum and its corresponding stress exhibit a near-perfect linear relationship. On this basis, the uniaxial absolute stress of steel members loaded by a test machine is measured by the proposed method. Parametric studies are further performed on three groups of steel members made of 65# steel and Q235 steel to investigate the factors that influence the testing results. The results show that the proposed method can measure and monitor steel-members uniaxial absolute stress on the laboratory scale and has potential to be used in practical engineering with specific calibration.

scholarly journals Crack Initiation Strength of Structural Steel Members Having Experienced Large Compressive Strain due to Buckling Deformation (Fifth Report)

2002 ◽  
Vol 2002 (192) ◽  
pp. 611-617 ◽  
Author(s):  
Motomichi Yamamoto ◽  
Hiroshi Yajima ◽  
Kazuhiko Matsuoka ◽  
Sadanobu Machida ◽  
Yuji Kisaka
Keyword(s):  
Crack Initiation ◽  
Structural Steel ◽  
Compressive Strain ◽  
Steel Members

Vehicle Body and Roll Cage Assessment involving Frontal, Side and Roll-over Crash Analysis by FEA using LS-Dyna

2021 ◽  
Vol 13 (4) ◽  
Author(s):  
V. Hariram ◽  
K. Venkatesh ◽  
M. Venkata Saidev ◽  
M. Surisetty Mahesh ◽  
M. Vinothkumar ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Structural Steel ◽  
Three Dimensional ◽  
The Body ◽  
Vehicle Body ◽  
Crash Analysis ◽  
Steel Members ◽  
Vehicle Collision ◽  
Six Degree Of Freedom ◽  
Frontal Side

Simulating the vehicle collision has gained importance in the automotive sector due to its accuracy, cost effectiveness and enhanced reliability. It aids in improving the safety of driver and passenger and also examine the cause of crash or collision. This numerical analysis investigates the materials capability to enhance safety. A three-dimensional vehicle model was developed along with its roll cage using solid work tool. Hypermesh work bench was employed to discretise the sensitive parts of the body and roll cage using beam 189 element having six degree of freedom at each node. The existing structural steel members were replaced with reinforced carbon fibre in all the sensitive part of the body and roll cage and its structural stability was assessed using the frontal, side and roll over crash simulation using LS Dyna. This investigation also reveals the change in internal energy, kinetic energy absorption and momentum transfer for both structural steel and carbon fiber under all the crash scenarios. The outcomes of this numerical investigation proved that the reinforced carbon fiber can be effectively replaced with the structural steel to enhance safety.

Discussion of “Turner on Capacity of Structural Steel Members”

1926 ◽  
Vol 89 (1) ◽  
pp. 1271-1286
Author(s):  
C. A. P. Turner ◽  
H. F. Moore ◽  
G. B. Woodruff ◽  
R. von Fabrice ◽  
F. E. Schmitt
Keyword(s):  
Structural Steel ◽  
Steel Members

Redistribution of Internal Torsional Moments Caused by Plastic Yielding of Structural Steel Members

Structures ◽  
2019 ◽  
Vol 17 ◽  
pp. 21-33 ◽  
Author(s):  
Rebekka Winkler ◽  
Anna-Lena Bours ◽  
Adrian Walter ◽  
Markus Knobloch
Keyword(s):  
Structural Steel ◽  
Plastic Yielding ◽  
Steel Members

scholarly journals Absolute stress field measurement in structural steel members using the Lcr wave method

Measurement ◽  
2018 ◽  
Vol 122 ◽  
pp. 679-687 ◽  
Author(s):  
Jingbo He ◽  
Zuohua Li ◽  
Jun Teng ◽  
Ming Li ◽  
Ying Wang
Keyword(s):  
Stress Field ◽  
Structural Steel ◽  
Field Measurement ◽  
Wave Method ◽  
Steel Members
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